Callum Simpson
Professional Boxer
Callum Simpson is a dynamic professional boxer making waves in the British boxing scene. Known for his speed, power, and unrelenting work ethic, Callum has quickly established himself as one of the most promising talents in the ring. As a Gym King ambassador, Callum brings the same determination to his training and personal style, embodying the brand’s values of grit, resilience, and ambition.
With explosive power and unshakable focus, Callum Simpson dominates in the ring. Watch as he shares a glimpse of his training and journey to becoming one of the top contenders in British boxing.
Career Highlights
Fight Record
20 fights • 19 wins • 13 KOs
2019
Callum made his professional debut against Elvis Dube, securing a points victory.
2022
Callum claimed his first professional title, defeating Ben Ridings to win the Central Area Super-Middleweight Championship.
2023
Callum made his BOXXER debut with a TKO win over Celso Neves, before adding victories over Boris Crighton and Jose de Jesus Macias.
2024
On 3 August, Callum defeated Zak Chelli at Oakwell Stadium to become British and Commonwealth Super-Middleweight Champion.
2025
Callum successfully defended his British and Commonwealth titles against Steed Woodall and Elvis Ahorgah before stopping Ivan Zucco to become European Super-Middleweight Champion. He finished the year with his first professional defeat, losing his titles to Troy Williamson by 10th-round TKO.
2026
Eight months later, Callum returned to face Williamson in a rematch at the First Direct Arena in Leeds. He won by unanimous decision after 12 rounds, avenging his only career defeat and reclaiming the British and Commonwealth Super-Middleweight titles.
Boxing has always been my passion. From the first time I stepped into the ring, I knew this was my calling. The discipline, the hard work—it’s all part of the process. Being a Gym King ambassador is a huge honor because the brand represents everything I believe in: resilience, hard work, and never giving up.
Callum’s journey to becoming a top contender in the boxing world hasn’t been easy, but his dedication and focus have pushed him through every challenge. He’s committed to inspiring others, showing that with the right mindset, anything is possible.
Before pursuing a career in boxing, Callum was a keen footballer, playing for Sheffield & Hallamshire County Senior League Premier Division side, Dodworth Miner's Welfare F.C. where his Dad was manager.
He left at the age of eight before taking up boxing in Bolton upon Dearne, Barnsley, later moving to train at Barnsley Star Boxing Club under Trevor Schofield.
He had 53 amateur fights, winning 38 before turning professional in 2019.
Discover Gym King Fight Division, Callums go-to that keeps him at the top of his game, from grueling training sessions to downtime.